Here is a shot of another bigger one of the plants. Sorry I don't know how to combine pictures in one post

They look normal to me. All squash does that, the older leaves yellow and die as the plant continues to vine out to newer and greater things. It's the main/new growth to care about and yours look healthy and fine.

If you're referring to those small "dead spots" on the leaves, my cucumbers do that every year, and probably some of my zucchini too. I've never known what it was, but it's never harmed production and the overall plant thrives.

This post was edited by loribee2 on Fri, Jun 20, 14 at 21:25

Thanks for the reply Loribee2! I found out I had spider mites so I sprayed some neem oil on those plants and all the other plants in my garden. Hopefully that is the end of the issue.